(a + b) ∶ (a - b) = 5 ∶ 3 হলে (a 2 + b 2 ) ∶ (a 2 - b 2 )-এর মান কত?

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(a + b) ∶ (a - b) = 5 ∶ 3 হলে (a² + b²) ∶ (a2 - b2)-এর মান কত?